NSDictionary 用于保存具有映射关系的数据，NSDictionary 包含两组数据，一组用来保存key值，一组用来保存valure值。
一个Key可以对应多个value，反过来则不可以。
//
// main.m
// NSDictionary
//
// Created by mac on 14-12-4.
// Copyright (c) 2014年
mac. All rights reserved.
//
#import<Foundation/Foundation.h>
void staticCreatDictionary()
{
NSDictionary * dict = [NSDictionarydictionary];
dict = [NSDictionarydictionaryWithObject:@"dictonary0"forKey:@"key1"];
dict = [NSDictionarydictionaryWithObjectsAndKeys:@"Dictionary1",@"key2",@"Dictionary2",@"key3",@"Dictionary3",@"key4",nil];
NSDictionary * dict1 = [NSDictionarydictionaryWithDictionary:dict];
NSLog(@"DICTIONARY:%@",dict1);
NSArray * keyArray = [NSArrayarrayWithObjects:@"k1",@"k2",@"k3",@"k4",@"k5",nil];
NSArray * valureArray = [NSArrayarrayWithObjects:@"Hello1",@"Hello2",@"Hello3",@"Hello4",@"Hello5",nil];
//通过数组创建
dict = [NSDictionarydictionaryWithObjects:valureArrayforKeys:keyArray];
NSLog(@"%@",dict);
//通过文件创建
NSDictionary * dict3 ;
dict3 = [NSDictionarydictionaryWithContentsOfFile:@"/Users/mac/desktop/a.txt"];
NSLog(@"Ditc3:%@",dict3);
}
void others()
{ NSDictionary * dict ;
dict = [NSDictionarydictionaryWithObjectsAndKeys:@"Dictionary1",@"key2",@"Dictionary2",@"key3",@"Dictionary3",@"key4",nil];
//计数字典大小
NSUInteger count = [dictcount];
NSLog(@"%lu",count);
//判断是否两个字典是否相同
NSDictionary * dict1;
dict1 = [NSDictionarydictionaryWithObject:@"dictonary0"forKey:@"key1"];
NSLog(@"%i",[dictisEqualToDictionary:dict1]);
[dict writeToFile:@"/Users/mac/desktop/a.txt"atomically:YES];
}
void keyAndValure()
{
NSDictionary * dict3 ;
dict3 = [NSDictionarydictionaryWithContentsOfFile:@"/Users/mac/desktop/a.txt"];
//返回所有key
NSArray * keysAtrray = [dict3allKeys];
NSLog(@"%@",keysAtrray);
//返回一个对象对应的所有key
NSArray * keyArray = [dict3allKeysForObject:@"Dictionary1"];
NSLog(@"%@",keyArray);
//返回一个key对应的valure
id obj = [dict3objectForKey:@"key2"];
NSLog(@"%@",obj);
//返回一组key对应的valure
NSArray * valureArray = [dict3objectsForKeys:keysAtrraynotFoundMarker:@"NoFound"];
NSLog(@"%@",valureArray);
}
void ergodic()
{
NSDictionary * dict3 ;
dict3 = [NSDictionarydictionaryWithContentsOfFile:@"/Users/mac/desktop/a.txt"];
//快速遍历
for (id
key in dict3) {
NSLog(@"%@",[dict3objectForKey:key]);
}
//迭代器方法遍历
NSEnumerator * keyEnum = [dict3keyEnumerator];
id obj;
while (obj = [keyEnumnextObject])
{
NSLog(@"%@",obj);
}
NSEnumerator * valureEnum = [dict3objectEnumerator];
id obj1;
while (obj1 = [valureEnumnextObject])
{
NSLog(@"%@",obj1);
}
//block方法遍历
[dict3 enumerateKeysAndObjectsUsingBlock:^(id
key, id obj,BOOL
*stop) {
NSLog(@"%@ %@",key,obj);
NSString * keyJuge = key ;
if ([keyJugecompare:@"key3"]==0)
{
*stop = YES ;
}
}];
}
void mutableDictionary()
{
//动态创建
NSMutableDictionary * dynamicDict;
NSArray * valueArray = [NSArrayarrayWithObjects:@"Hello1",@"Hello2",@"Hello3",@"Hello4",nil];
NSArray * keyArray = [NSArrayarrayWithObjects:@"1",@"2",@"3",@"4",nil];
dynamicDict = [NSMutableDictionarydictionaryWithObjects:valueArrayforKeys:keyArray];
NSLog(@"%@",dynamicDict);
//替换元素元素
[dynamicDict setObject:@"What"forKey:@"1"];
//删除元素
[dynamicDict removeObjectForKey:@"1"];
NSLog(@"%@",dynamicDict);
}
int main(int
argc, constchar
* argv[]) {
@autoreleasepool {
// insert code here...
NSLog(@"Hello, World!");
// staticCreatDictionary();
// others();
// keyAndValure();
// ergodic();
mutableDictionary();
}
return0;
}